Ore-roasting furnace



UNITED STATES VPATENT OEEICE.

JAMES B. RANDOL, OF NEW ALMADEN, CALIFORNIA.

ORE-ROASTING l-l'URNACE.

SPECIFICATION forming part of Letters Patent No. 243,402, dated June 28, 1881. Application led August 4, 1880. (No model.)

To all whom it may concern:

Beit known that I, JAMES B. BANDOL, of New Almaden, Santa Clara county, State of California, have invented a new and useful Improvement in Ore-Roasting Furnaces, of which the following is a specication.

M y invention relates to that class of furnaces used for reducing quicksilver ores which have two compartments in which the ore is roasted side by side, discharging their dbris through a slot common to both directly below the division-wall separating them; and it consists in the application of a certain partition set below the girder carrying the division-wall, which separa-tes the dbris from each compartment, thereby improving the discharge, as hereinafter described.

In the accompanying` drawings, which rep resentaportion of a Hutt-ner and Scott furnace, patented October 31, 187 6, No. 183,934, (imprcved,) Figure lis a transverse sectional elevation, and Fig. 2 is a longitudinal sectional elevation of same.

' Like letters of reference refer to like parts in both figures.

In the drawings, A A are the ore-chambers, in-which the slanting shelves B are placed, which receive the ore as it descends through the ames.

C is the divisionwall separating the compartments A A. This wall is supported upon the hollow girder D, which rests in the side walls E E. Underneath this girder the dbris from the two compartments nds its exit through the narrow slot Fin the bottom of the furnace, under which it is thence carried away in cars, into which it falls. The girder D is of necessity as wide as the wall it is intended to support-gen erally nine in ches-and the slanting shelves at the bottom must meet at the very edge of the narrow discharge-slot. This being a condition requisite to maintain a proper space for the dbris to run between each lower edge of the girder and the face of the slanting shelves, the bottom ot' the girder must be such a distance above the slot as to leave a space below in which the discharging dbris from each compartment will meet, and, when not at once discharged, accumulate until the space is entirely filled. When the discharging of the dbris is again resumed it has been found almost impossible to obtain aregular and equal discharge from each compartment, sometimes one compartment discharging freely and the other being completely' stopped. This difficulty arose from the banking up of the dbris upon one side or the other of the slot, as the chance might be, the dbris being kept back on that side while the discharging progressed on the other. Now, to obviate this difticulty I have provided the thin partition G, which extends down from the bottom of the girder to within about an inch of', or level with the slot,

the entire length ofthe slot and directly over the center of the same. This partition is made ot either plate-iron or tile, or it may be a continuation of and cast with the girder, the 0bject being simply to provide a suitable mea-ns of separating the two streams of discharging debris, and preventing one from owing into and interfering with the other until finally discharged.

What I claim as my invention, and desire to secure by Letters Patent, is as follows:

In an ore-roasting furnace, the combination of theore-chambers A A and division-wall C, supported on the girder D, with the thin vertical partition G, projecting to, or nearly to, the slot F in the bottom of the roasting-chamber, and operating to separate the roasted ore descending from both compartments, and secure its even and free discharge through the slot F, substantially as and for the purpose herein described.

' JAMES B. BANDOL. Witnesses GEORGE PARDY, JOHN RAEEERTY. 

